Yanmar Seawater Pump Impeller Kit 119574-42530

The Yanmar 119574-42530 Impeller Kit is a seawater pump service kit for select Yanmar 6LY-series marine diesel engines. It is used to service the raw-water pump impeller, helping maintain proper seawater flow through the cooling system and reduce the risk of overheating. Current references list this kit for several 6LYA, 6LY2, 6LY2A, 6LY400, and 6LY440 applications, with the kit commonly supplied with the impeller, cover O-ring, and cover plate screws.

Key Features

• Seawater pump impeller service kit
• Genuine Yanmar part reference: 119574-42530
• Used for raw-water / seawater pump maintenance
• Helps restore cooling-water flow through the engine cooling system
• Common kit contents include:
  • Impeller
  • Cover plate O-ring
  • Cover plate screws / bolts, quantity 6
  • Lubricant / glycerine in some kit listings
• Related earlier references include 119574-42550, 119574-42551, and 119574-42552 in supported applications

Engine Compatibility

This impeller kit is commonly listed for select Yanmar 6LY-series engines, including 6LYA-UTE, 6LYA-STE, 6LYA-STP, 6LY2-STE, 6LY2-WDT, 6LY2A-STP, 6LY2A-UTP, 6LY2M-WDT, 6LY2M-WST, 6LY400, and 6LY440 applications depending on the exact seawater pump and engine serial number. Some references specifically identify this kit for 6LY440 and 6LY2A, while broader references also include 6LYA and 6LY2 family models.

Serial Number Fitment Notice

Seawater pump impeller fitment depends on the exact Yanmar engine model, seawater pump assembly, pump cover style, and serial number range. Confirm compatibility using the engine serial number and current pump parts diagram before ordering. Several sources distinguish this kit from the 6LY3 impeller kit and note that 6LY3 applications should use a different kit, so pump-level verification is important.

When This Part Needs Replacement

Replace the impeller during scheduled seawater pump service, after overheating, after dry running, or when the impeller vanes are cracked, stiff, worn, missing, or permanently bent. A weak or damaged impeller can reduce cooling-water flow and may lead to engine overheating.

Installation Notes

Inspect the pump cover, O-ring groove, cover screws, cam, wear plate, pump body, and shaft condition while the pump is open. Lubricate the new impeller as specified, install it in the correct rotation, and confirm the cover O-ring is seated properly before tightening the cover hardware evenly. After startup, verify seawater discharge and check for leaks at the pump cover.

Alternate/Superseded Part Numbers

• 119574-42530
• Yanmar 119574-42530
• YM11957442530
• 119574-42550
• 119574-42550-01
• 119574-42551
• 119574-42552
• Related 6LY3 kit reference: 119578-42750 confirm by engine and pump before substituting

Parts Desk Insight

This kit is close to other Yanmar 6LY impeller kits, so the safest match is the seawater pump assembly, not just the engine family. If the engine is a 6LY3, double-check before ordering, because multiple references separate the 6LY3 pump kit from 119574-42530.

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